*{box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:#f5f5f5;margin:0;padding:20px}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;margin:-20px;color:#666}.loading-spinner{width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid #007bff;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.login-container{display:flex;align-items:center;justify-content:center;min-height:100vh;margin:-20px}.login-card{background:#fff;border-radius:8px;box-shadow:0 2px 10px #0000001a;padding:40px;text-align:center;max-width:400px;width:100%}.login-card h1{margin:0 0 10px;color:#333}.login-notice{color:#666;margin-bottom:30px;font-size:14px}.google-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:12px 24px;background:#4285f4;color:#fff;border:none;border-radius:4px;font-size:16px;cursor:pointer;width:100%}.google-btn:hover:not(:disabled){background:#357abd}.google-btn:disabled{opacity:.7;cursor:not-allowed}.error-banner{background:#fee;border:1px solid #fcc;color:#c00;padding:12px 16px;border-radius:4px;margin-bottom:20px;font-size:14px}.app{max-width:500px;margin:0 auto;background:#fff;border-radius:8px;box-shadow:0 2px 10px #0000001a;padding:20px}.app-header{display:flex;justify-content:flex-end;margin-bottom:10px;padding-bottom:10px;border-bottom:1px solid #eee}.user-info{display:flex;align-items:center;gap:12px;font-size:14px;color:#666}.sign-out-btn{padding:6px 12px;background:transparent;color:#007bff;border:1px solid #007bff;border-radius:4px;font-size:14px;cursor:pointer}.sign-out-btn:hover{background:#007bff;color:#fff}h1{margin:0 0 20px;color:#333;text-align:center}.add-form{display:flex;gap:10px;margin-bottom:20px}.add-form input{flex:1;padding:10px 12px;border:1px solid #ddd;border-radius:4px;font-size:16px}.add-form input:focus{outline:none;border-color:#007bff}.add-form input:disabled{background:#f9f9f9}.add-form button{padding:10px 20px;background:#007bff;color:#fff;border:none;border-radius:4px;font-size:16px;cursor:pointer}.add-form button:hover:not(:disabled){background:#0056b3}.add-form button:disabled{opacity:.7;cursor:not-allowed}.loading-indicator{display:flex;flex-direction:column;align-items:center;padding:40px;color:#666}.loading-indicator .loading-spinner{width:30px;height:30px;border-width:3px}.loading-indicator p{margin:15px 0 0;font-size:14px}.todo-list{list-style:none;padding:0;margin:0}.todo-item{display:flex;align-items:center;gap:10px;padding:12px;border-bottom:1px solid #eee}.todo-item:last-child{border-bottom:none}.todo-item input[type=checkbox]{width:20px;height:20px;cursor:pointer}.todo-item .text{flex:1;font-size:16px}.todo-item .text.completed{text-decoration:line-through;color:#888}.todo-item .delete-btn{padding:5px 10px;background:#dc3545;color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:14px}.todo-item .delete-btn:hover{background:#c82333}.empty{text-align:center;color:#888;padding:20px}